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#ifndef _BCACHE_SUPER_H
#define _BCACHE_SUPER_H
#include "extents.h"
static inline size_t sector_to_bucket(const struct cache *ca, sector_t s)
{
return s >> ca->bucket_bits;
}
static inline sector_t bucket_to_sector(const struct cache *ca, size_t b)
{
return ((sector_t) b) << ca->bucket_bits;
}
static inline sector_t bucket_remainder(const struct cache *ca, sector_t s)
{
return s & (ca->mi.bucket_size - 1);
}
static inline struct cache *bch_next_cache_rcu(struct cache_set *c,
unsigned *iter)
{
struct cache *ret = NULL;
while (*iter < c->sb.nr_devices &&
!(ret = rcu_dereference(c->cache[*iter])))
(*iter)++;
return ret;
}
#define for_each_cache_rcu(ca, c, iter) \
for ((iter) = 0; ((ca) = bch_next_cache_rcu((c), &(iter))); (iter)++)
static inline struct cache *bch_get_next_cache(struct cache_set *c,
unsigned *iter)
{
struct cache *ret;
rcu_read_lock();
if ((ret = bch_next_cache_rcu(c, iter)))
percpu_ref_get(&ret->ref);
rcu_read_unlock();
return ret;
}
/*
* If you break early, you must drop your ref on the current cache
*/
#define for_each_cache(ca, c, iter) \
for ((iter) = 0; \
(ca = bch_get_next_cache(c, &(iter))); \
percpu_ref_put(&ca->ref), (iter)++)
static inline bool bch_dev_may_remove(struct cache *ca)
{
struct cache_set *c = ca->set;
struct cache_group *tier = &c->cache_tiers[ca->mi.tier];
/*
* Right now, we can't remove the last device from a tier,
* - For tier 0, because all metadata lives in tier 0 and because
* there is no way to have foreground writes go directly to tier 1.
* - For tier 1, because the code doesn't completely support an
* empty tier 1.
*/
/*
* Turning a device read-only removes it from the cache group,
* so there may only be one read-write device in a tier, and yet
* the device we are removing is in the same tier, so we have
* to check for identity.
* Removing the last RW device from a tier requires turning the
* whole cache set RO.
*/
return tier->nr_devices != 1 ||
rcu_access_pointer(tier->d[0].dev) != ca;
}
void bch_dev_release(struct kobject *);
bool bch_dev_read_only(struct cache *);
const char *bch_dev_read_write(struct cache *);
bool bch_dev_remove(struct cache *, bool force);
int bch_dev_add(struct cache_set *, const char *);
void bch_fs_detach(struct cache_set *);
bool bch_fs_read_only(struct cache_set *);
bool bch_fs_emergency_read_only(struct cache_set *);
void bch_fs_read_only_sync(struct cache_set *);
const char *bch_fs_read_write(struct cache_set *);
void bch_fs_release(struct kobject *);
void bch_fs_stop(struct cache_set *);
void bch_fs_stop_sync(struct cache_set *);
const char *bch_fs_open(char * const *, unsigned, struct bch_opts,
struct cache_set **);
const char *bch_fs_open_incremental(const char *path);
extern struct mutex bch_register_lock;
extern struct list_head bch_fs_list;
extern struct workqueue_struct *bcache_io_wq;
extern struct crypto_shash *bch_sha256;
extern struct kobj_type bch_fs_ktype;
extern struct kobj_type bch_fs_internal_ktype;
extern struct kobj_type bch_fs_time_stats_ktype;
extern struct kobj_type bch_fs_opts_dir_ktype;
extern struct kobj_type bch_dev_ktype;
#endif /* _BCACHE_SUPER_H */
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